Check valve

ABSTRACT

A check valve has a plate guided sidewise by ribs and serving as a closure. The plate along with a closure spring and a spring support is located in a flat casing with a valve seat. The check valve is particularly characterized in that the spring support along with the guiding ribs for the valve plate consists of a rigid wire box fixed in the casing containing all the parts of the check valve.

United States Patent 72] Inventor Heinz Paul Scholz Kirchweyhe, Germany [21] Appl. No. 868,126 [22] Filed Oct. 21, 1969 [45] Patented Jan. 11, 1972 [73] Assignee Gustav F. Gerdts KG Bremen, Germany [54] CHECK VALVE 2 Claims, 6 Drawing Figs. [52] U.S. Cl l37/543.l9, 251/337 [51] Int. Cl ..Fl6k 15/02, Fl6k 17/04 [50] Field ofSearch ..137/533.19,

543.19, 312; 251/337; 261/1 14 VT [56] References Cited UNITED STATES PATENTS 2,904,065 9/1959 Butlin 137/543.19 X

Primary Examiner-Samuel B. Rothberg Assistant Examiner-David .l. Zobkiw AttameyRichards & Geier ABSTRACT: A check valve has a plate guided sidewise by ribs and serving as a closure. The plate along with a closure spring and a spring support is located in a flat casing with a valve seat. The check valve is particularly characterized in that the spring support along with the guiding ribs for the valve plate consists of a rigid wire box fixed in the casing containing all the parts of the check valve.

PATENTEHJAM 1 m2 sum 2 [1F 2 53 .614

lave/r for ATTO CHECK VALVE This invention relates to a check valve and refers more particularly to a check valve of the type having a valve plate guided sidewise by ribs and located along with the closure spring and a spring support in a flat casing having a valve seat.

Such check valves are described, for example, in French Pat. No. 1,086,204. They are preferably mounted in a flangelike support so that they can be easily fixed between two pipe flanges.

An object of the present invention is to improve and simplify these prior art check valves with respect to their construction and expenditure of materials, and also with regard to work required for their manufacture, particularly as far as assembly is concerned, thereby greatly reducing the manufacturing costs.

Other objects will become apparent in the course of the following specification.

In the accomplishment of the objectives of the present invention it was found desirable to make the spring support along with the guides for the valve plate out of a rigid wire box firmly held in a casing containing all the parts.

This construction makes it possible to easily and firmly attach the wire box having the guiding ribs and the spring support into the casing without the use of tools. This saves a substantial amount of time during assembly and also results in great savings in material and weight. The construction of the present invention results in a substantial drop in price.

According to a particularly advantageous embodiment of the present invention the wire box consists of two individual looped pieces which intersect each other in the direction of the flow and which are joined at the intersection by welding or the like. They have upper portions or spokes extending transversely to the flow and constituting the support for the closure spring while the loop arms are bent rectangularly in the direction toward the valve seat and there serve as guiding ribs for the valve plate.

According to a further feature of the present invention, the attachment of the wire box within the casing is carried out by bending the arms close to the valve seat rearwardly in opposite directions so that from then on they form freely elastic arm portions which, close to the bent portions, engage an annular groove of the valve seat, the ends of the arm portions being elastic and projecting into a recess provided in the casing.

To increase the finnness of the seat, it was found advisable to provide the arm portions projecting into the recess of the casing with extensions corresponding to the curvature of the casing, the free ends of which are bent inwardly, so as to provide an easy handling of the wire box in case of repairs.

According to a further particularly advantageous construction of the present invention the rigidity of the wire box is increased, its seat in the valve casing is stabilized and it is secured against unpremeditated loosening by looped arms which are rectangularly bent into arm portions annularly enclosing the valve seat inthe circular groove while the free ends of the ann portions are bent rearwardly away from each other, whereby these ends firmly hold them in a circular recess upon a side of the casing.

Due to this arrangement, only the looped arms are subjected to tension, so that the wire box has a high shape strength and bending or buckling force will not cause changes in its shape.

Furthermore, a secure seat for the wire box is provided capable of withstanding high forces. In addition, by diminishing the number of bendings which must be carried out, the manufacturing costs are greatly reduced.

In the just described construction it was found desirable to continue the free flange ends up to the looped arms and there to clamp them firmly, whereby the ends of one loop located in the circular groove extend up to the arms of the adjacent loop which serve as guiding ribs.

The casing which usually consists of a wrought or cast piece, can conform to the object of the present invention to make a check valve of a particularly light structure, by being made as a metal sheet body formed without turning, for example, by drawing.

The invention will appear more clearly from the following detailed description when taken in connection with the ac companying drawings, showing, by way of example only, preferred embodiments of the inventive idea.

In the drawings:

FIG. I is partly a section and partly a side view of a check valve constructed in accordance with the present invention? FIG. 2 is a top view of the check valve shown in FIG. 1. some parts being shown in section;

FIG. 3 is a top view of a portion of a somewhat differently constructed check valve, some parts being shown in section FIG. 4 is a section through a portion of the checldvalve shown in FIG. 3;

FIG. 5 is partly a section and partly a side view of a differently constructed check valve;

FIG. 6 is a top view of the check valve shown in FIG. 5.

Similar parts are designated by the same numerals in the drawings. i

The check valve shown in FIGS. 1 and 2 has a valve casing I provided with a valve seat 2 and a valve plate 3 pressed against the set 2 by a spring 4. i

In accordance with the present invention a wire box 5 is provided for the guiding of the valve plate and as a spring support. The wire box consists of two intersecting looped pieces6 and 7 which are joined at their juncture 8 by welding or the like. The top ribs or spokes 9 of the looped pieces of the wire box 5 extend transversely to the direction of the flow and constitute holders for the spring 4. Arms .10 bent at right-angles to the spokes and extending toward the valve seat 2, forniguiding ribs for the valve plate 3. I

As shown in FIGS. 1 and 2, the arms 10 constituting the guiding ribs are bent rearwardly in opposite directions close to the valve seat 2 and their bent portions ll engage an annular groove 12 provided in the valve seat. The U-shaped bent portions 11 of the looped pieces continue as springlike arm portions 13 which then continue as extensions 14 adapted to the inner curvature of the casing and resiliently engaging into a recess 15 provided in the top portion of the casing so as to hold the wire box firmly in its position within the casing.

To provide an easy removal of the wire box in case of repairs, the free ends 16 of the extensions 14 are bent inwardly and thus facilitate the application of tool. i

In the construction of a check valve shown in FIGS. 3 and 4 the ends 16 of the arms are bent downwardly toward the valve seat 2 and extend close to the valve seat. Thus these ends form additional guiding ribs 17 for the valve plate 3, the ribs 17 being located between the guiding ribs 10. I

While the ends 16' could extend into the annular groove 12 shown in FIGS. 1 and 2, in the construction of FIGS. 3 and 4 the groove 12 is eliminated and is replaced by recesses 18 receiving the bent portions 11 and theribs 1-7.

In some cases it may be advantageous not to weld together the looped pieces 6 and 7 constituting the wirebox, but to insert them separately into the casing. In that case the recesses 18 receiving the parts 1] and 17 will prevent a shifting of the looped pieces relatively to each other. I

In the construction of the check ,valve shown in FIGS. 5 and 6 the loop arms 10 are rectangularly bent, forming curved portions 19 extending into the annular groove 12. Their ends 20 extend opposite each other, then reach up to the arms .10 and are bent backwardly so that longitudinal U-shaped portions are formed; furthermore, they firmly hold the portions 19 in the groove 12 and are located in a recess,2l provided in the side of the casing.

The arm portions 19 of one looped piece extend up to the other looped piece so that in this simple manner the looped pieces are effectively secured in their positions.

Obviously, the wire box can be fixed to the casing by other means, for example, by welding or the like. I

I claim:

1. A check valve, comprising a casing having a valve seat, a valve plate located within said casing a spring located within said casing and engaging said valve plate, and a rigid wirebox located within said casing and having two separate intersectarms having free ends extending into said recess.

2. A check valve in accordance with claim 1, wherein said free ends of the arms have curved portions, corresponding to the curvature of the casing and terminating in inwardly projecting endings.

t I! IF t 

1. A check valve, comprising a casing having a valve seat, a valve plate located within said casing, a spring located within said casing and engaging said valve plate, and a rigid wire box located within said casing and having two separate intersecting looped pieces, said looped pieces being joined at their intersection and having upper top ribs constituting holders for said spring and U-shaped arms extending perpendicularly to said top ribs toward said valve seat and constituting guiding ribs for said valve plate, said casing having an annular groove, the bent portions of said arms being located in said groove, said casing also having a recess located above said groove, said arms having free ends extending into said recess.
 2. A check valve in accordance with claim 1, wherein said free ends of the arms have curved portions, corresponding to the curvature of the casing and terminating in inwardly projecting endings. 